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Given below are two statements : one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R).$
Assertion $(A) :$ Aluminium is extracted from bauxite by the electrolysis of molten mixture of $\mathrm{Al}_{2} \mathrm{O}_{3}$ with cryolite.
Reason $(R):$ The oxidation state of $Al$ in cryolite is $+3$.
In the light of the above statements, choose the most appropriate answer from the options given below:
$(A)$ is true but $(R)$ is false
$(A)$ is false but $(R)$ is true.
Both $(A)$ and $(R)$ are correct and $(R)$ is the correct explanation of $(A)$
Both $(A)$ and $(R)$ are correct but $(R)$ is not the correct explanation of $(A)$
Solution
$(A)$ Aluminium is reactive metal so Aluminium is extracted by electrolysis of Alumina with molten mixture of Cryolite
$(B)$ Cryolite, $\mathrm{Na}_{3} \mathrm{AlF}_{6}$
Here $\mathrm{Al}$ is in $+3$ $O.S.$
